what do you understand by proton number and nucleon number
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The mass number (symbol A, from the German word Atomgewicht [atomic weight]), also called atomic mass number or nucleon number, is the total number of protons and neutrons (together known as nucleons) in an atomic nucleus.
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Proton number gives us the value of Atomic Number of the element.
Nucleon number = Proton + Neutron
It gives us the Mass Number of a Nucleus.
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